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Letters Patent No. 78,269,-datd May 26, 168.

IMPROVED ROOFING-GOMBOUN D.

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TO ALL WHOM IT MAY CONCERN: V V

Be it known that I, DRAKE W. DENTON, of Ithaca, Tompkins county, NewYork, have invented an Improved Roofing; and I do hereby declare thatthe following is a full and exact description thereof.

My object is to make a roofing by the use of coal-tar, by the use of ana rticle that has a greater natural aflinity for the tar than ordinarymaterials, as sand, clay, grave], and other similar substances; and alsoto avoid the inconvenience of the ordinary adhesiveness of the materialin trowelling off, or finishing by the trowel, the surface of theroofing,.thus getting a higher finishe d and more compact surface. I

For this iaurpose I take any form ofbitnminons coal, and so heat it asto render it nearly or quitelcoke by any convenient process, and thenpulverize it, so that it shall be either a fine dust, or dust with'coarser particles, and then-mix it with the 'coal-tar, so as to be ofsuitable consistency; andthis, for the purpose that the semi-coked coal,or coke not over burned, may, in the drying and hardening, reactchemically, or by its nature, on the tar and make a roofing, not merelyenveloped substances in the tar, but which, tending to re-form coal,shall have a close and a permanent adhesion and unity. V

If convenient, I use ordinary commercial coke, pulverized.

Forthe sake of a finished surface,'I apply coal-ashes to or mixed withthe surface, both for the surface thus obtained, and the handling of thetrowel.

By these materials, and this process and use, I obtain a fine and adurable roofing. v The advanta'ges and use of my invention are apparentto those skilled in the art to which-it appertains.

Claims.

1. I claim preparing my roofing-material of the substances andsubstantially in the manner set forth.

2-. I claim its use with coal-tar, as described; V

3. I claim the use of coal-ashes, in combination with the describedmaterial, and in the manner set forth.

, DRAKE W. DENTON.

Witnesses:

SAMUEL J. PARKER, S. B. Beans.

